Latest threads in Hobby Electronics Basicsshow only best voted threads
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Help: I Need A Timer
I've been searching around and can't seem to find a simple plug-in LED timer with a large red number display (like an alarm clock). It would have to be a "count-up" timer with six digits that show the...
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15 years ago
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Increase voltage using capactior etc
Hello. I have a project where I'm making a digital picture frame/media center out of an old laptop. I took the systemboard/lcd out of the case and mounted in a shadow box. Everything went well. I made...
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15 years ago
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Highside FET extending on time indefinitely
This is from AN978 pg18 using IR's bootstrapped HS drivers. You can see from the picture they have the timer tied to ground through a 100k resistor why not just use the HS driver's 12Vdc return? Is...
3
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15 years ago
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3 | |
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Voltage regulators fail high
I've been using 5V regulators - L7805ACV and others. I've had some failures, no doubt due to careless wiring on my breadboard. The problem is that, when they fail, they fail high. Ie, instead of...
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15 years ago
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27 | |
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Battery power supply
Hello, I'm more of a software-guy but I have a microcontroller project underway that is intended to run off battery power. The MCU draws about 30mA at 3V and I had intended to run this off a CR2450...
2
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15 years ago
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Stepper motor testing
Is there a way I can test a stepper motor on my bench without the driver? Does anyone make a stepper motor test device? Thanks Russ
14
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15 years ago
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OT: What font settings?
Outlook Express: TOOLS>OPTIONS>READ>FONTS Are folks here here set to Courier New in "Proportinal Font:" AND "Fixed-Width Font"? If I set fonts this way, am I okay with newsgroup postings in general?
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15 years ago
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Need a good book on how to use an Oscilloscope
I know the basics of using a scope but my scope HP1710a (working now), has more inputs outputs and knobs than I know what to do with. Anything out in the public domain in pdf would be preferable but...
10
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15 years ago
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10 | |
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Looking for a cable connector
I need to replace a cable connector on the control panel of a HP psc 750xi printer. The control panel pops off the rest of the printer fairly easily, and is connected to the rest of the printer by a...
2
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15 years ago
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2 | |
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Help configuring battery
I use a CPAP machine to keep my airway open while I sleep. I want to configure a light and energy dense battery setup so I can go camping with my CPAP. Figure on three days worth of power. Trying to...
2
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15 years ago
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i need some electrical projects
i need some electrical projects
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15 years ago
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0V in a schematic
I can see that when you see a voltage statement on a schematic, that is a statement of the voltage at that point with reference to some other point in the schematic. It's not saying necessarily that...
26
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15 years ago
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Astable Multivibrator - why does it break down?
Hello, I have questions about this version of an Astable Multivibrator: +v |______________ | | R1 1M e | ________b Q2 PNP | | c | | | | | | | c | |___b Q1 NPN | | e | | | | | GND | | | C1 10uF | | |...
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15 years ago
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Effect of the supply internal resistance
I'm looking at voltage dividers. Trying to learn what I probably knew one time. Say you have a battery supplying 10v, and it has in internal resistance of 1 Ohm. You connect it to a voltage divider...
26
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15 years ago
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26 | |
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UK source for this magnetic switch?
Can anyone point me towards a UK source (phone or online) for an inexpensive cylindrical, enclosed reed switch, N/C, for use in a burglar alarm circuit please. I'm still googling but so far without...
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15 years ago
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